Summer twilight lasts a long time in this valley — nine o'clock and the western sky is still pale behind the mountain while sprinklers tick across yard after yard from Brentwood north toward Oakley. Pacheco & Son's Landscaping Inc. keeps the lawns under those sprinklers in shape, mowing on a dependable rotation and cutting the edges so each border reads clean from the street. Heat management is half the job here: raise the deck through the worst weeks, keep the blades sharp, vary the mowing direction so the turf never lies down in one groove. Trimmer work takes the fence lines and tree bases, and the walks get cleared before the truck moves on. There is quiet pride in a route of yards that all look right on the same evening.